Draining and filling with coolant: Audi 2.5 TDI (ACV, AHY, AJT, AUF, …)

🧭 Before you start

Fits: platform codes 70A, 70B, 70C, 70E, 70H, 70J, 70K, 70L, 70M, 7DA, 7DB, 7DC, 7DE, 7DH, 7DJ, 7DK, 7DL, 7DM

• Opens: coolant

Don't miss

• Observe regulations for disposal!
• Fill with coolant slowly up to max. mark on expansion tank (filling time approx. 5 minutes)
• When the engine is at normal operating temperature, the coolant level must be on the max. mark and between the min. and max. marks when the engine is cold.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📐 20 workshop diagrams for ACV

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Open filler cap on coolant expansion tank
2. Remove noise insulation tray 50.
3. Drain coolant: [Note: Observe regulations for disposal!]
4. Screw drain plug in again and tighten to 10 Nm [Note: Only G 12, G 12 plus according to "“TL VW 774 F”" or G 12 plus-plus according to "“TL VW 774 G”" may be used as coolant additive; distinguishing feature: Purple colourG 12, G 12 plus or G 12 plus-plus and coolant additives marked conforming to "“TL VW 774 F”" or "“TL VW 774 G”" prevent frost and corrosion damage, scaling and also raise boiling point of coolant. Therefore, the cooling system must be filled all year round with frost and corrosion protection additives.G 12, G 12 plus or G 12 plus-plus purple (according to "“TL VW 774 F”" or "“TL VW 774 G”" may be mixed with the previous G 12 coolant additives!Because of its higher boiling point, the coolant improves engine reliability under heavy loads, particularly in countries with tropical climates.Frost protection is required down to about -25°C (in countries with arctic climate: Down to about -35°C).The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The coolant additive concentration must be at least 40%.If, due to climatic reasons, greater frost protection is required, the amount of G 12, G 12 plus or G 12 plus-plus can be increased, but only up to 60% (frost protection to about -40°C). Otherwise frost protection and cooling effectiveness are reduced again.If radiator, heat exchanger, cylinder head or cylinder head gasket are renewed, do not reuse old coolant.] — 10 Nm (7.4 lb-ft)
5. Screw the adapterV.A.G 1274/3A+4A appropriate to this vehicle onto the expansion tank.

6. Fill coolant circuit using cooling system charge unitVAS 6096operating instructions for cooling system charge unitVAS 6096.
7. Open bleeder screw in coolant hose to heat exchanger
8. Press upper radiator hose downwards
9. Close bleeder screw
10. Fill with coolant slowly up to max. mark on expansion tank (filling time approx. 5 minutes)
11. Start engine, run for max. 2 minutes at approx. 1500 rpm and top up coolant to overflow hole on expansion tank with engine running
12. Fit expansion tank cap.
13. Run engine until fan cuts in
14. Check coolant level and top up if necessary
15. When the engine is at normal operating temperature, the coolant level must be on the max. mark and between the min. and max. marks when the engine is cold.

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